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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fa7478a05be1abef0507caf6ce329c3b885cec3ca268a3b5d46972096dc5d8b0' 
  AND token = 'rHGgxqjQISgtxn9KzlA/9BwtaeqbeTzSb1QSIbYSdMM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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