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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5199b077733595c6981207c9a6fe6b08da44ed910c057dbc0131dcf12a6d417e' 
  AND token = '/PxzdSXOVqAf10RL4m369FcBglfGgIIZFDkJ0Y1+Q9s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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