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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c805d73089f3047c14714a9ae698c13f18883d70c80f2b4f9d6ea2b71788de2' 
  AND token = 'ulg7mDI50g+dOhEQgHo69Y+OuUax6zF9Ih8tWTc5UWo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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