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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9753e033460389ab88cc426267d6c7724f72fed6510c2a555daf01dd34decbba' 
  AND token = '3Necv6OSlMJ/5AUy9ATEyr9IJ4edpRuYv0CoF7D3+6E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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