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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7724ab1274a1d6662df22a0ab08eb85c14914a3abc42124af1ce69af3ec74ad' 
  AND token = '14grT16NBxs6kymYNyJi+encNOeqf7MeMZqN6tcilbk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00013

JSON explain

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