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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23433f2ca938f4f0e764a39e209ce02dc1f128aae2f163bffa9ad53b1b91698a' 
  AND token = '+hOa4kg2A197tWkaT70ImzAlb7bqcIAosf1XEf1cSG0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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