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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8b01293203fb42e78636a8c5dd2faf2e108bf6b99090cf0e5295782ebe13ced' 
  AND token = '/Yst6cv/k9r3/kBQ8wd0tZlFxyGXTDa1FnE4qtJC1/Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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