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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '606b6ea2cb8706be09d63058a2c40d1dad75da739c44d83c0f725552112b7317' 
  AND token = 'L6m+J9FXqaDm9o7Jvz5fUUcFoRWrdR3X6ETrfJ/pNPs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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