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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9738a8de2ea75631504e82c8fccb3d7a1c9238cd697cb106821e129fb7ee7a8d' 
  AND token = 'xnw8bmKBBK0WBOWXiQgv0DMXlgUHebOOQn0f9cpxHf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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