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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cc75d53352118c20ab1b5c3199de226c11bb62f6aaad5a2ade72944d7057b124' 
  AND token = 'cJlRlsfo8VVc+uHed0SxrcfL67Xc1+7BswFZDb/03Dk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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