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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6cd4dac7a679f2d2ae256ee5aff33ff454a57c1a5ef1222f6c7c21c02cff066' 
  AND token = '5YxQzlIpSZ9Orfo7JU4fuxyt9juexNgQNAKricXkY0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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