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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4702a276fc0f1a6048573eb48dc0335ade97ecdef5a70758685d75b3ed5123cd' 
  AND token = 'J1l1wcgxpOsirveRldumegTV5eP9VDBQ2azQbr8zHyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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