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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '447a6947f6226d71846d07929bcc1636eaba6e195352ce80f875affd6ad1ad86' 
  AND token = 'E379t2JgMf9hsuHx+NXI3T8pOIwBjf7cYPWrrRzoczc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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