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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2966c7a24e5dcbb9ccc644e21ef9d4524cf82a216f7b0f8f419aa5ef20aa20e0' 
  AND token = 'QRpzwqgaSkVk72VhpAJ9Ftg/K98+SUHU/FdK/bdI6QY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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