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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96854430f2eef154f5a67c8d49452d290a88328d49de41be3ab91de241f12ba0' 
  AND token = 'JSpa6R7YCA/lYfzQQFFdb1mt6vmanYPtqXmNgX8QJSw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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