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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0cae0a67b24b24eca4b28cef2de5f6d42a3d4ef528be9d7e745e187128df4241' 
  AND token = 'BgPIwz0jF3I4PIiFUVjGQbV6XvwubNY18jTJWgFe7Sg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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