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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a26b1a31cebb253a9d2f877d66972b383b348876190c5f779d75cdb343a5c67' 
  AND token = 'uyiE+jIjy1g4Jc6zvcbRp6OeCc1fEpunE/neICjnK+s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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