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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '64970e79252fd1868e6dd6c5b83a047a535bfe3f6d046abe11418a6ddfe3f203' 
  AND token = 'YQz1z43RRDEcOA+SR2LxPjg+paObedzczc1J4et+GAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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