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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb95bb9c914ff4ff577b55e924ff32fe835ae4854d81a1d9277fdc7b3b59155f' 
  AND token = 'phaoL2oStpmuGPPid2td0T7lbjl7xUlE2UZ0XYamEcs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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