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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb39f35d38a6aa407674caa41e5ec128b501e92511c12f36b7aab1968bdf4aa' 
  AND token = '5/5oZEqJ3sB/k9ItBRfNcEayKkmlAjEaKXraj/HANLA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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