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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41f4fd0acf42e550b13c6154e263ca90d15b8f6fb8244758fcfeac890489363a' 
  AND token = 'VaCIe3cyTeKr2Ozn+MWS6TEkqY2Ou1EH5s2vsfqiAh4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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