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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e610847a72afe254b17e76da75332676ae58af7e93af9af2ff36b1ea0f8a19c7' 
  AND token = 'yKtSNLr3w9KvOw+XiDJrrxHNe/KvQrG/HMin/J3lpJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00106

JSON explain

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