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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3959b9bf44d5072a39c3e32994443a53de0b5c6d66e62d7f4825387364f46f6c' 
  AND token = 'LNuNl90QH9W0V+yxphP0Pyor5bCZXlRrI6cuCv40fco=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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