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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd201575b0fa584ae4f1e616d5e1c9482353ef259dd6a9cc68d72668adbc1861' 
  AND token = 'HPFGsK2qO7BW145Mlcs2L8kvt43IfuYL7GgMw8LKH9E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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