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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd8667eeafbddb0e862496a604085f81bb6d7ffb3ab5a8a6d8b5c683381518d6' 
  AND token = 'a3B6P5goSRpIno1M5Rdsf1MeP1P9LuQQD6PCLn6WJWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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