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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4f33e06dd4510804cc909d88a71372bae7f8cd726226b540a37618430b9602aa' 
  AND token = 'eOP69zPL546v0v3NX+sjUT0z8JvFQ7qleb/ap+SgYCU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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