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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1a62c1cc35c54c3f10c6360f565772004bf3844095a9b5ddec5e54b29bdf6ef9' 
  AND token = '9L5KQXKzz5IFc+l+GTzfzuruSp15/b0IGEa5Sg893uw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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