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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c09bc4271340aa02622a781cd4e4d33cfb6d33c68acfea99c84f03d811a94f01' 
  AND token = 'xPxgSAusJAm6wFz07g00XlyZdsU2OQRmDy/nx83LN4E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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