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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e16d23b6731b48d85ad64310470e8b4ec4aeae91592e4439e7513bf9d6a20ca2' 
  AND token = '1FAPp5tsmX+TJdB+UczEmB4hfo93DFAC+idK4HxEvlA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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