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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '81f2be141ff9fb80ce944671b8abf61a663dc04aa9cb2b2697b61454c98ec114' 
  AND token = 'fjG2pLXeSB6fVrYyzPHAdvz2KtnSrd5IZbWmajlSK7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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