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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94360f16c867531b6500c60a03947166d42a6c5f7198f6f47779f392f598cff5' 
  AND token = 'GmZ9omISoEOekbY04MHt9IjvgGl+x5N+sOzi0LqjhjI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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