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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56074710063f6af514efb6f9573195b2ed87df6d4176ae33d7819a7a207272c0' 
  AND token = 'SC4vnyTzfPqArvQCNUW35NBtpPm5b9tjeTAHrmUkP5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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