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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '825d647f0f72b0d45bf147bec2b4c4d496b7a44c5f867bdf65ecf026edb69b5a' 
  AND token = 'ntEBZyN5sOcKduMQ5xICZutNK0nXp2vbVDnFU9nXz10=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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