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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0931fea06fa8343a1146ec718293dcbbba837d8aa9f3235a4f3d3164a7ca69e6' 
  AND token = 'lqR7v1lBQp9+cnpx/U0Q4G5L0eIg2HtWBzTu74WGjMk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00064

JSON explain

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