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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e3d83e7324a24bd984aad3277c830eae78b2c69e1b42b85e8bae6102ab9220f' 
  AND token = 'krIdmR8z5tzwfFAJDT67YTYVc8NhD1rJKldECZv67EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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