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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3cab17c18237b6430cc642437a6222fe6160f22a3b33dc23127cc5b2b8987db7' 
  AND token = 'FfJNUfJ+Q+I2e+A8E7/NjAYIu8Vka5bLdu/EL2idA+8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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