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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3286a33d2c6c1f911ac4ab6ba6a304829315c844ae9739204bcf7052130a867e' 
  AND token = 'R5fCjv59QIBycaPpE0rO9Sbxf6MzJPh6+GfUsuEVM5U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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