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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8ccdd4a1964c73156c15d163d31682f21efdde33e4f116328126c017a38bfba3' 
  AND token = 'n2HW2pCmFcVknm63Lqy5zGqHA3AuWbFn6evV5zYpBg8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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