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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58545460196e9bd0fe53ef3128f63e71a6fb6bce6bc76e0a630ed51afb9eab28' 
  AND token = '3TJxTKdxC5ApV2Wmq53ZbHZJPA6KNzQQBambyV+qqZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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