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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f2086703263952366dd31c47ea0ca460e3f1710884ef79a2e5a9e582ebe8c4c4' 
  AND token = 'pfgVuRod031hSUIZYu5CzPmX5B016YQDc6r4PbBJrzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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