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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0704df5ff2ea06414cdcc67c4756c1df82d77eb029c7f8368cdda17a508d7211' 
  AND token = 'aQXzt3eYO4se9DEOW4PVClNGSTFzgJQvk5PXlr+6NkA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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