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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dfb774dd89dda58f0b8456ad192ff9a46997af9ea63b18a6f9884af5976eda69' 
  AND token = 'Jh7Mug3gYDaS0H4AHSjZhd01/lKBFQB2P92+V5QF9no=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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