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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '479b0a9a0ae99ed8af23a3afec6e82308fc870338ffec3a76b51cfb8e3ec4c64' 
  AND token = '3NG/xdvxnGmi1FQdCqN8MZ6eQgMb5bo1p2bJIOAzkhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}