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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e16abba83dd72f1e76a370517ff3811caa82cc735fedcac8a6d7630423c5128' 
  AND token = 'P+83MbJqcfUx/qw/MObtwPQIREL7O69Xp0SZIWnIm4c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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