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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd6fc7d206e72cf1f2aef50cbe682af9e26e2630d2fc191cd7fffa18c31c124dd' 
  AND token = 'f2zSp33MQScDzy34DpSUQbdug2RAYHUWLoqejFtM628=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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