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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03445322a53e0825a03274b731ad126f0cd37450851310652d53beba184ca69b' 
  AND token = '466F7pGdwQLfk/f/wUwCQlAO/LhO3ugCUAHiq2f9YdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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