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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfa34eb66fd7f1cb4b694665a91fb697e3884b50b5c2e7f9a3383fe68d9c86ee' 
  AND token = 'H3ai91omAq+AIi40u2wVNaZxtqmrq+ZMRDMd6heYfUo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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