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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ca9e59e90763eefab66341c867b2a1cf42688733262ef1ee10c28ce97351cdb1' 
  AND token = 'eDvZk+qydvNLcwqZnBeb9xcxXiX3WRgTAuL43vqYqdw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00066

JSON explain

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