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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ccac669207d96549992262529935c018e192ffc62522ea6574be4d27892eaea' 
  AND token = 'G3qjl/CMdZK8uYmvmJufcverHuFQoj9MqfU3RrO8H8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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