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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '86fdf4ad096084f9232b6ba1f121e3be2d154f45b7774244385ed31e38c798ea' 
  AND token = 'nchJ1HmMTDOVEmnLSQyjfOdawv32vhZOil3XMGc/2fE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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