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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '296590b2fcb833d7eaa31a20bb748da50a9d1613630e46aedb76eb8f614f0f30' 
  AND token = '3TothlglmHIzRsegh2oMOdkYxD3r2WJIyyt41k1Frsg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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