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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '669fac3724a4582397600a17420bc96343b5d36dccbe0d95dccd9502dbe41dcc' 
  AND token = 'UXNQLnd3Dbhuwm7pVXFUOgFaAMhHAc5K0X7sjhDHKfU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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