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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0c7880881519622051c05256c1bbc86e6fe6268c4d1c6d5803da59c65a517b36' 
  AND token = 'wWd4MRvOSwMEA4l42eNcPBv7fPQp5pRReQTCb2ayLCA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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