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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ebcc8677badb50ba82f01cfe272c218ece288f778bd288ebbaa2900d34b8d09f' 
  AND token = 'TTDRuWw5U2HmnSOau5Ldy5iUHyIe1PMJ5dUqq4e9dB8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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