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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '82e96961d803d39aa122dfdae0de918e397cbe05a838f4b5469c5d9786ee8724' 
  AND token = 'X5cRNpbnBFflbI9tvin5TSPZDFz3Xc0t28qWkM+b2Nk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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