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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3aa6814ec9ff185fb78e91f3bb2024e9d705775e9455103a62166e40bb9f2f1f' 
  AND token = 'Xzip5ZyAT5mqY2/xHE0Qab6dVZXDZI0p37/Xv9KlV7U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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