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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '99ed087b92eb9ed4a4e7ba1bdaa2ef94f129bc3423a425995348b5ee55969ce5' 
  AND token = 'rCEbLxD01LXjFN/oxm5wWLr9vomQKIEeIb+RZedtYIo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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