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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a2628dda09a658d5ad0e8a2988dbbc33cec21d2b393e2b340f01034d6fdc0088' 
  AND token = 'IEvAsI8jlyt7q8CyxvXAIYNRsT8j5bQiOOOBXWl5lks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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